Data on price of Y quantity demand for X when income is 100,and quantity demand for X when income is 200 are given in the following table. The price of X is fixed at $7.

Price of Y QDx. QDx

Income$100. Income$ 200

0. 114.5. 46.5

1. 115. 47.8

2. 115.5. 49.1

3. 116. 50.4

4. 116.5. 51.7

5. 117. 53

6. 117.5. 54.3

7. 118. 55.6

8. 118.5. 56.9

9. 119. 58.2

10. 119.5. 59.5

A Calculate income elasticity of demand X using the midpoint method when income increases from $100 to $200 and when price of Y is fixed at $9 explain answer

B Calculate cross price elasticity of demand for X when price of Y decreases from $9 to $8 and when income is $100.Explain your answer